Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751316AbbHBKHz (ORCPT ); Sun, 2 Aug 2015 06:07:55 -0400 Received: from www.linutronix.de ([62.245.132.108]:57696 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750879AbbHBKHy (ORCPT ); Sun, 2 Aug 2015 06:07:54 -0400 Date: Sun, 2 Aug 2015 12:07:25 +0200 (CEST) From: Thomas Gleixner To: Toshi Kani cc: Jan Beulich , peterz@infradead.org, mingo@kernel.org, x86@kernel.org, bp@suse.de, linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86, pat: Add comments to cachemode translation tables In-Reply-To: <1437665929.3214.313.camel@hp.com> Message-ID: References: <1437588371-28223-1-git-send-email-toshi.kani@hp.com> <55B0A9110200007800094558@prv-mh.provo.novell.com> <1437661620.3214.281.camel@hp.com> <55B11B4D0200007800094AE9@prv-mh.provo.novell.com> <1437665107.3214.310.camel@hp.com> <55B126070200007800094BD5@prv-mh.provo.novell.com> <1437665929.3214.313.camel@hp.com> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1073 Lines: 30 On Thu, 23 Jul 2015, Toshi Kani wrote: > On Thu, 2015-07-23 at 09:36 -0600, Jan Beulich wrote: > > > > > > > > On 23.07.15 at 17:25, wrote: > > > Yes, I agree with you. But such risk is very low -- 1) the regular > > > case > > > (no fallback) is used most of the cases, 2) the code using WT knows > > > what > > > type of memory it is dealing with. For example, pmem may map NVDIMM > > > with > > > WT, and any sane BIOS sets MTRR to WB for NVDIMM. > > > > Do the words "sane" and "BIOS" really fit together in your opinion? > > :-) > > Anyway, I am not disagreeing with you... When UC is ready for both regular > memory and IO memory, it should be changed to fall back to UC. What's the resolution of this discussion? Is that patch correct as is or do we get an updated version? Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/